XYSplineRenderer goes out of image bounds

Question

When I use XYSplineRenderer on org.jfree:jfreechart it goes out of the bounds where it renders it...

I tried

        XYSplineRenderer splineRenderer = new XYSplineRenderer(15);
        splineRenderer.setDefaultShapesVisible(false);
        plot.setRenderer(splineRenderer);

but the graph "glitches" out of the plot...